Image switch from page to page

Hi
I’m new in using ModX and I have coded a homepage where I want some different images to be displayed on different pages but who do I do that?
The images shows a number "01", "02", "03" etc. and these images is what I want to be displayed on the different sites where I maybe use a tag in my template to show it.
Am I going to make a Template Variable or what?

Yes, use a TV with the input type "image" and the output widget also "image".

Thanks very much for the fast answer. It works for me I just thought it was more difficult to switch an image